PHPUnit9.0 断言-assertIsString()

assertIsString($actual[, $message = ''])

PHPUnit9.0 断言集合

当 ​$actual​ 的类型不是 ​string ​时报告错误，错误讯息由 ​$message​ 指定。
​assertIsNotString()​ 是与之相反的断言，接受相同的参数。
示例 1.42 assertIsString() 的用法

<?php
use PHPUnit\Framework\TestCase;

class StringTest extends TestCase
{
    public function testFailure()
    {
        $this->assertIsString(null);
    }
}

$ phpunit StringTest
PHPUnit latest.0 by Sebastian Bergmann and contributors.

F

Time: 0 seconds, Memory: 5.00Mb

There was 1 failure:

1) StringTest::testFailure
Failed asserting that null is of type "string".

/home/sb/StringTest.php:8

FAILURES!
Tests: 1, Assertions: 1, Failures: 1.